Squatter's rights, or adverse possession, varies from state to state.

If that's unlikely and you need to force a move, your goal would be to regain possession of the property as quickly as possible, with the least amount of monetary loss, and the least amount of damage.

Brokerages can be highly territorial and possessive.  

Access to the land may be granted through adverse possession if the current owners have been passing over the neighbor's land for many years.  

If the lease is silent on this topic, then generally whoever takes possession of the house, whether that's the bank or a new owner, must honor the terms of your lease until it is finished.  

Maybe the person paying the taxes is trying to get it under adverse possessionhttp://www.nolo.com/legal-encyclopedia/who-can-claim-property-based-adverse-possession-colorado.html

I would list the basic 6-7 points on a single page: price, terms of payment, property condition, possession, escrow, title, buyer vesting. 

There are a number of ways to have it YOUR way when investing - Ask the seller to loan it to youDo an installment down payment agreementGive the seller a note - pay him a percentage of the rent you will be collectingGive the seller a post dated check - post dated for 2 yearsOffer a blanket mortgage on another property you ownAsk seller to repair something (we call it the"Front Porch clause) instead of him doing it, he gives a check in that amount ($50,000) that it will take to do the repair - you endorse the check and give it back to him as the down-payment.Borrow SOFT MONEY on another property you ownBring a limited partner in on the deal - they borrow money on their property - you pay them back over time with a nice interest and don't forget a buy out clauseAsk your girl friend, your Mother or drinking buddies - offer a free apartment for a limited amount of timeAsk the owner to finance 100% of the deal - keep him in as a limited partner Offer 20% more for the building if the seller will take back a principal only mortgage (that is without interest) offer a balloon payment and split notes.Ask the seller to let you manage the building for a year - collect the rents and make improvements from the rents receivedOwner financing with split notes (details on this to come)Proposal to the owners daughter - make friends with the seller's wife - let him know you really want this property - beg for help - tell him you are a nice person - just getting started Offer a Hybrid offer - offer less - improve the building and give seller 20% of the profitsTry a Delayed Settlement with right of possession and subject to the mortgage - you make payments until settlement 1-2 years later.

Your thinking shoot the tenant did this they need to pay.. the tenant having many options ( and they do in most rental markets) and not having a whole lot of possessions and being fairly transient by nature ( ergo the term I stay at this home I don't live here common phraseology in the mid west)  they just pack up their few possessions and they leave.. especially if they have a voucher.So as you go forward unless its really bad minor repair items that are needed that are tenant caused look at those carefully first and decide do you want a vacancy that will cost you thousands or should you just pay the 100 bucks or so and fix the small item there by not losing a ( what was up to this event a good tenant) and now have a vacancy that cost you 10 to 20 times the amount of this little battle.Just another perspective and one I have learned the hard way..

The most important thing is to get possession of the property as unfortunately in Texas you are very unlikely to collect on the judgement